Conference Proceeding

A Revisit: Method for Determining Cation Exchange Capacity of Natural Zeolite

Dr. Arina Shairah Abdul Sukor

Clinoptilolite is one of the most abundant natural zeolites and it remained as residual mineral phases during weathering of volcanic parent materials (Ming and Dixon, 1986).The fundamental building block of natural zeolite is a tetrahedron of four oxygen atoms surrounding silicon (Si4+) or aluminium (Al3+) atom. The physical structure of zeolite is porous with interconnected cavities in which exchangeable cations (Na+, K+, Mg2+, Ca2+) and water molecules are present. The adsorption of counter cations contributed to the net negative charge of natural zeolites derived from isomorphous substitution of Si4+ by Al3+ (Dyer and White, 1999).Natural zeolites are classified as low cost adsorbents and it has been widely used in management of radioactive wastes from the nuclear reactor, gas purification, petroleum production and wastewater treatment (Ames, 1961; Hor et al., 2016). One of the important properties of zeolite is the cation exchange. Among the factors affecting cation exchange of natural zeolite from aqueous solutions are washing frequency, chemical conditioning, contact time, type of displacement solution and the presence of soluble and competing ions in aqueous solution. Based on the study by Ames (1960), the cation selectivity series in natural zeolite is described as Cesium, Cs+>Ammonium, NH4+>Potassium, K+>Sodium, Na+>Calcium, Ca2+ >Magnesium, Mg2+. The cation selectivity of natural zeolite is advantageous for the efficient storage of fission products Cs137generated from nuclear power plant. Based on the 11th Malaysia Plan 2016-2020, Malaysia is exploring the usage of nuclear power as an alternative energy resource (Khattak et al., 2016).The natural zeolite is abundant worldwide in huge deposits, readily available and inexpensive compared to the synthetic zeolite. Natural zeolites have been widely used as ion exchanger but often limited to countries having their own natural zeolite deposits such as the United States of America, Russia, China, Turkey and Indonesia. The purpose of this study was to quantify the cation exchange capacity (CEC) of natural zeolite from different locations (Bayah and Cikembar in West Java, Indonesia) and particle sizes (0.15 and 0.079 mm) using different displacement solutions of 0.5M cesium chloride (CsCl) and 0.5 M potassium chloride (KCl).

Published: 08 November 2017


Copyright: © 2017 Dr. Arina Shairah Abdul Sukor. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.